2002/05/29 by D. Vion, A. Aassime, A. Cottet +5 · 1 citation
Physics and Astronomy · #cond-mat.mes-hall #cond-mat.supr-con #quant-ph
paper · pdf · doi:10.1126/science.1069372
published as Science 296, 886-889 (2002) · 4 figures included
arxiv created 2002/05/29 · arxiv updated 2009/11/30
We have designed and operated a superconducting tunnel junction circuit that behaves as a two-level atom: the ``quantronium''. An arbitrary evolution of its quantum state can be programmed with a series of microwave pulses, and a projective measurement of the state can be performed by a pulsed readout sub-circuit. The measured quality factor of quantum coherence Qphi=25000 is sufficiently high that a solid-state quantum processor based on this type of circuit can be envisioned.